the New-York Historical Society building for the duration of the project, which ultimately cost $36 million. The work included completely reconstructing the List Building and transforming its interior into a 232-seat auditorium, enlarged the museum's gross floor area from , and moved its main entrance to 92nd Street. The annex was clad with limestone from the quarry that had supplied the original construction. The museum reopened on June 13, 1993. The museum completed a renovation of its third-floor galleries in January 2018. The renovation, designed by the firm of Tsao & McKown, involved removing a staircase and unsealing some windows that faced Central Park. Architecture The Warburg House is located at 1109 Fifth Avenue, on the corner of Fifth Avenue and East 92nd Street in the Carnegie Hill neighborhood of the Upper East Side. The mansion's lot measures approximately . As originally constructed by Gilbert, the house only used of its Fifth Avenue frontage; the rest was used as a garden. The house was designed and built with six floors and a basement in the Châteauesque style, a choice inspired by the Fletcher House (now Sinclair House) at 2 East 79th Street. As the Warburg House was being constructed, Jacob Schiff unsuccessfully tried to convince the Warburgs to build the house in a more classical style, as Schiff thought the Châteauesque style was overly ostentatious. The Warburgs' son Edward Warburg said his grandfather only slightly disapproved of the style, contrary to a popular rumor that held that Schiff thought the ornate design would inspire antisemitism. Exterior The exteriors are clad with Indiana limestone. The building has had two façades since 1993, both of which are characterized by a profusion of windows with Gothic ornament. As built in 1908, the 92nd Street elevation of the façade was designed asymmetrically while the Fifth Avenue elevation was symmetrical. On both elevations, the first through fourth stories are clad in limestone. The fifth and sixth stories contain dormer windows that project from a steeply sloped mansard roof, which is clad with slate tiles. The fifth-story windows are surrounded by ornate limestone frames. Art historian E. Wayne Craven noted a similarity of the façade to the Hôtel de Cluny in Paris. The house's main entrance is within a projecting frontispiece on 92nd Street, which contains a depressed elliptical arch at ground level, above which is a balcony with a balustrade. According to the Real Estate